EP2765590A1 - Tripping mechanism for surge protector and surge protector - Google Patents
Tripping mechanism for surge protector and surge protector Download PDFInfo
- Publication number
- EP2765590A1 EP2765590A1 EP20120847145 EP12847145A EP2765590A1 EP 2765590 A1 EP2765590 A1 EP 2765590A1 EP 20120847145 EP20120847145 EP 20120847145 EP 12847145 A EP12847145 A EP 12847145A EP 2765590 A1 EP2765590 A1 EP 2765590A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tripping
- slidable block
- tripping mechanism
- electrode
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000007246 mechanism Effects 0.000 title claims abstract description 63
- 230000001012 protector Effects 0.000 title claims abstract description 43
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 25
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 25
- 229910000679 solder Inorganic materials 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims description 6
- 238000010292 electrical insulation Methods 0.000 abstract description 4
- 230000001965 increasing effect Effects 0.000 abstract description 4
- 238000003466 welding Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
- H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/10—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess voltage, e.g. for lightning protection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
- H01H2037/762—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure
Definitions
- This invention relates to a surge protector, and especially relates to a tripping mechanism for the surge protector.
- Surge protectors are commonly used in the electrical circuits used in families, offices and industrial sites, etc. to prevent damage to the electrical apparatus caused by the instantaneous overvoltage in the circuits.
- the surge protector can conduct and divide the current in an extremely short time so as to avoid the damage to other apparatus in the circuits caused by the surge.
- the most commonly used surge protector comprises an element called metal oxide varistor (MOV) for transferring the redundant voltage.
- MOV metal oxide varistor
- the metal oxide varistor has a very large resistance in normal working state, and thus substantively shows an off state.
- the resistance of the MOV dramatically decreases, and thus the MOV is almost in a conductive state and transfers a large volume of current to eliminate redundant voltage.
- the metal oxide varistor will age and thus generate heat.
- it is common to provide an tripping mechanism in the surge protector, the tripping mechanism and the metal oxide varistor are connected in series so that the metal oxide varistor disconnects with the circuit when the temperature rises.
- Fig. 1 shows a tripping mechanism adopted by the prior art.
- the tripping mechanism mainly comprises a substantially plate-shaped tripping rod 1, the tripping rod 1 is mounted on a frame bracket 2 through a pivot 3 provided on the frame bracket 2 of the surge protector so as to be able to swing, and an upper end 11 of the tripping rod 1 is biased towards the right side of Fig. 1 , i.e. towards the trip direction, by biasing springs 4.
- a remote signal switch lever 12 is integrally formed at a lower end of the tripping rod 1, the remote signal switch lever 12 cooperates with a remote signal switch (not shown) to trigger the remote signal switch.
- the middle portion of the tripping rod 1 is welded to MOV 5 through low-temperature solder (not shown), the tripping rod 1 is further connected to a terminal 9 of the surge protector through a lead 8, and the terminal 9 connects to an outside circuit.
- the other electrode of MOV 5 connects to the other terminal 10 of the surge protector, and thus the surge protector is connected to the circuit.
- One end of the indicator bracket 6 is an indication part, commonly in green color, the indication part can be exposed through an opening provided on a housing (not shown) of the surge protector, and thus the indication part is visible from outside.
- a red indication part is formed on the frame bracket 2 at a position corresponding to the green indication part.
- the tripping rod 1 In the normal working state, the tripping rod 1 is soldered to MOV 5 through low temperature solder, and the tripping rod 1 electrically and mechanically connects to MOV 5. Meanwhile, the tripping rod 1 is located at the position shown in Fig. 1 , and the indicator bracket 6 is maintained at the position shown in Fig. 1 by abutting against the upper end of the tripping rod 1; and at the same time, the green indication part on the indicator bracket 6 covers the red indication part on the frame bracket 2, and thus the green indication part, which indicates that the surge protector is currently in normal working state, can be seen from outside of the housing of the surge protector.
- the tripping rod 1 rotates clockwise about the pivot 3 in the figure under the action of the biasing springs 4, and thus the electrical connection between the tripping rod 1 and MOV 5 is disconnected. Meanwhile, the remote signal switch lever 12 at the lower end of the tripping rod 1 triggers the remote control switch with the rotation of the tripping rod 1 so as to send to the remote control apparatus a signal indicating the tripping of the tripping rod 1.
- the indicator bracket 6 slides towards right on the upper side of the frame bracket 2 under the action of the biasing spring 7, and thus the green indication part moves to the right side to expose the red indication part provided on the frame bracket 2, and thus the red indication part, which indicates the tripping of the surge protector, can be seen from outside of the housing of the surge protector.
- the conventional tripping mechanism of the surge protector has following problems: the tripping rod 1 moves substantially in a plane parallel to a side of MOV 5, and thus even in the case that the tripping rod 1 trips, the electrical distance between the tripping rod 1 and the electrode of MOV 5 is very short, and this is disadvantageous to the electrical isolation between the tripping rod 1 and the electrode of MOV 5 in the trip state. Furthermore, the protection level and current leakage capacity of the standard MOV product are limited, and the cost of adopting non-standard single sheet product is high. So, for example, when a nominal discharge current of 35kA is required, two standard single sheet MOVs of 20kA are usually used to achieve this, so a solution occurs where two MOVs are used.
- This invention is made based on the problems of the prior art, and an object of the invention is to provide a tripping mechanism for a surge protector, the tripping mechanism can ensure the electrical distance between a tripping rod and MOV in the trip state, and when a plurality of MOVs are used, simultaneously tripping of the plurality of MOVs can be easily realized.
- a tripping mechanism comprising: a frame bracket for receiving at least one metal oxide varistor; and a tripping rod pivotably arranged on the frame bracket and connected to the one electrode of the electrodes of the metal oxide rheostat via low temperature solder.
- the tripping mechanism further comprises a slidable block slidably arranged on the bracket frame, the slidable block is slidable between a first position and a second position and is biased towards a trip position; in a normal working state, the slidable block is maintained at the first position by the tripping rod counteracting the biasing pressure, and in a trip state, the sliding movement of the slidable block towards the second position under the action of the biasing pressure causes the tripping rod to pivot in a direction away from the electrode of the metal oxide varistor.
- the tripping mechanism further is further provided with a swing arm which is pivotally mounted on the frame bracket, and the sliding movement of the slidable block towards the second position causes the swing arm to pivot to trigger a remote control switch.
- the tripping of the tripping rod and the swing of the swing arm are both realized by the movement of the slidable block, so the structure of the whole tripping mechanism is simplified, the manufacture cost is reduced and the reliability of the mechanism is improved.
- the slidable block is provided a state indication part indicating the normal working state, and when the slidable block is at the first position, the state indication part is visible from outside through an opening or a transparent window provided in a housing of the surge protector.
- the frame bracket is provided with a state indication part indicating the trip state, when the slidable block is at the first position, the state indication part indicating the trip state is shielded by the state indication part indicating the normal working state provided on the slidable block, and when the slidable block is at the second position, the state indication part indicating the trip state is exposed and is visible from outside through the opening or the transparent window provided on the housing of the surge protector.
- the slidable block comprises an inclined surface, the tripping rod abuts against the inclined surface when the slidable block is at the first position.
- the slidable block is located between the electrode and the tripping rod when the slidable block is at the second position.
- a channel is provided on a lower side of the inclined surface, the electrode is received in the channel when the slidable block is at the second position.
- the slidable block is located between the tripping rod and the electrode of MOV, and receives the electrode in its channel, further enhancing the electrical insulation strength between the tripping rod and the electrode of MOV.
- the tripping mechanism further comprises one or more biasing springs, one end of which is attached to the slidable block, and the other end of which is attached to the frame bracket to bias the slidable block towards the second position.
- a first end of the tripping rod pivotably connects to the frame bracket, and a second end of the tripping rod is welded to the electrode.
- the second end of the tripping rod is formed with a slit, and the electrode is inserted into the slit and is welded thereto.
- the welding reliability between the electrode of MOV and the tripping rod can be improved by inserting the electrode of MOV into slit and being welded at the slit, and such lateral soldering method can reduce the thermal impact of the surge on the MOV.
- two metal oxide varistors are received in the bracket frame of the tripping mechanism, and the respective electrodes of the two metal oxide varistors are welded at the same position of the same tripping rod, i.e. the two respective electrodes of the two metal oxide varistors are both inserted into the slit of the tripping rod and are welded there through low-temperature solder.
- a surge protector which comprises the above tripping mechanism.
- the tripping mechanism 100 comprises a frame bracket 110, the frame bracket 110 is substantially in the form of a square frame and is used to receive a MOV 200.
- a pivot 111 is formed at the right upper corner of the frame bracket 110, and a tripping rod 120 is pivotably arranged on the frame bracket 110 around the pivot 111.
- a circular recess or a hole can be formed at one end 121 (the right end in the drawing) of the tripping rod 120, and the pivot 111 is inserted into the circular recess or the hole.
- the tripping rod 120 is connected to a terminal 300 of the surge protector through a lead 122, and the terminal 300 is used for connecting the surge protector with an external circuit.
- connection end is substantially in the form of a flat panel
- connection end is substantially in the form of a flat panel
- concave platform 123 is formed at substantially the meddle part of the flat panel in the width direction of the flat panel shaped connection end
- the concave platform 123 is formed with a through slit 124 at its middle portion, the through slit 124 may open at one end or both ends of the through slit 124 are closed.
- a slidable block 130 is arranged on an upper side surface of the frame bracket 110.
- the slidable block 130 is slidably arranged on the upper side surface of the frame bracket 110, for example, a guide portion 112 is provided on the frame bracket 110, and the slidable block 130 can slide under the guidance of the guide portion 112.
- biasing springs 140 are further provided (two springs in the drawing), one end of the biasing springs is attached to the right end of the slidable block 130, and the other end of the biasing springs is attached to the pivot 111, and thus the slidable block 130 is biased towards the right side under the action of the biasing springs 140, i.e. is biased towards the pivot 111.
- the slidable block 130 is formed with an indication part 131, i.e. a green indication part, at its left end. Similar to the prior art, in the state as shown in Fig. 2B , the green indication part is exposed through an opening or a window provided in the housing of the surge protector to indicate that the surge protector is in a normal working state.
- Another pivot 113 is formed at the lower side of the frame bracket 110, a swing arm 150 is pivtoably arranged on the frame bracket 110 through the pivot 113, and one end (the lower end in the drawing) of the swing arm 150 is formed with a switch trigger part 151 for triggering a remote control switch which is not shown in the drawing.
- the other end (the upper end in the drawing) of the swing arm 150 is formed with a driven portion 152 which engages with a protrusion 132 provided on the slidable block 130, and the protrusion will push the swing arm 150 to rotate clockwise about the pivot 113 when the slidable block 130 slides towards the right side.
- the MOV 200 comprises two electrodes 210 and 220. As shown in Figs. 3C and 4 , in the normal working state, the MOV 200 is received in the frame bracket 110, and one electrode 210 of the MOV is inserted into the slit 124 formed in the concave platform 123 of the tripping rod 120, and is connected to the tripping rod 120 through a low temperature solder 400. The other electrode 220 of the MOV 200 is connected to the other terminal 500 of the surge protector, e.g. through welding, while the other terminal 500 is connected to an external circuit.
- the MOV 200 is connected to one phase of the external circuit through the tripping rod 120 and the terminal 300, and on the other hand, is connected to the other phase of the external circuit through the other electrode 220 and the other terminal 500 of the surge protector, and when the voltage between the two phases of the external circuit exceeds the predetermined voltage, the MOV 200 conducts the two phases and functions to divide the current and reduce the voltage.
- the middle part of the slidable block 130 is formed with an inclined surface 133, an edge of the connection end of the tripping rod 120 abuts against the inclined surface 133, and thus preventing the slidable block 130 from moving towards the pivot 111 by the biasing spring 140.
- the slidable block 130 is located at the first position, the indication part 131 is visible from outside through the opening or the transparent window provided on the housing of the surge protector, thus indicating that the surge protector is in a normal working state.
- Fig. 5 shows the tripping mechanism in the trip state. In the state shown in Fig.
- the slidable block 130 has slided to the second position on the right side, pushing the tripping rod 120 away upward, and at the same time the slidable block 130 covers the electrode 210 of the MOV 200; at this time, the electrode 210 is received in the channel 134, and thus the electrode 210 and the tripping rod 130 are electrically isolated.
- the green indication part 131 has moved to the right, and thus a red indication part 114, which is provided on the frame bracket 110 and was shielded by the green indication part 131, is exposed.
- the protrusion 132 on the slidable block 130 pushes the driven portion 152 of the swing arm 150, making the swing arm 150 rotate clockwise about the pivot 113, and thus the switch trigger part 151 triggers the remote control switch (not shown), sending surge protector tripping signal to the remote control apparatus.
- Figs. 6 and 7 show the tripping mechanism according to the second embodiment of the invention
- the structure of this tripping mechanism is substantially the same as that of the one described above, the difference lies in that the frame bracket 110 receives two MOVs 200.
- the electrodes of the MOVs 200 are both inserted into the slit 240 of the tripping rod 120, and are welded to the tripping rod 120 through low-temperature solder 400.
- the mechanism trips simultaneously. Since other parts of the second embodiment are the same as the first embodiment, and the description is omitted.
- the tripping rod 120 rotates in a direction away from the electrode 210 of the MOV 200, as a result, the electrical distance between the tripping rod 120 and the electrode 210 is increased, the reliability of the electrical insulation between the tripping rod 120 and the electrode 210 is improved.
- the slidable block 130 slides to a position between the tripping rod 120 and the electrode 210 of the MOV 200, and covers the electrode 210 of the MOV 200, and thus the electrical insulation strength between the tripping rod 120 and the electrode 210 is further enhanced.
- the electrodes 210 of two MOVs 200 are welded at the same position of the tripping rod 120 by using low-temperature solder, when the temperature rises, even if two MOVs 200 transfer different amount of heat to the welding point through their respective electrode, since the hest is applied to the same welding point, the mechanism will trip simultaneously, and thus improve the reliability of the tripping mechanism.
- both the pivoting of the tripping rod 120 and the swing of the swing arm 150 are activated by the sliding of the slidable block 130, as a result, the structure of the whole tripping mechanism is simplified, the cost of the production is saved and the reliability of the whole tripping mechanism is improved.
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- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
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Abstract
Description
- This invention relates to a surge protector, and especially relates to a tripping mechanism for the surge protector.
- Surge protectors are commonly used in the electrical circuits used in families, offices and industrial sites, etc. to prevent damage to the electrical apparatus caused by the instantaneous overvoltage in the circuits. When peak current or voltage suddenly occurs in the electrical circuits or communication lines due to the external disturbance, the surge protector can conduct and divide the current in an extremely short time so as to avoid the damage to other apparatus in the circuits caused by the surge.
- The most commonly used surge protector comprises an element called metal oxide varistor (MOV) for transferring the redundant voltage. The metal oxide varistor has a very large resistance in normal working state, and thus substantively shows an off state. When the voltage in the circuit exceeds the predetermined value, for example, under the circumstance of lightening strike, etc., the resistance of the MOV dramatically decreases, and thus the MOV is almost in a conductive state and transfers a large volume of current to eliminate redundant voltage.
- However, after a long time use, the metal oxide varistor will age and thus generate heat. In order to prevent the metal oxide varistor from being damaged due to overheat, and to prevent disasters such as fire due to the rise of temperature, it is common to provide an tripping mechanism in the surge protector, the tripping mechanism and the metal oxide varistor are connected in series so that the metal oxide varistor disconnects with the circuit when the temperature rises.
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Fig. 1 shows a tripping mechanism adopted by the prior art. The tripping mechanism mainly comprises a substantially plate-shaped tripping rod 1, thetripping rod 1 is mounted on a frame bracket 2 through apivot 3 provided on the frame bracket 2 of the surge protector so as to be able to swing, and an upper end 11 of thetripping rod 1 is biased towards the right side ofFig. 1 , i.e. towards the trip direction, by biasingsprings 4. A remotesignal switch lever 12 is integrally formed at a lower end of thetripping rod 1, the remotesignal switch lever 12 cooperates with a remote signal switch (not shown) to trigger the remote signal switch. Furthermore, the middle portion of thetripping rod 1 is welded toMOV 5 through low-temperature solder (not shown), thetripping rod 1 is further connected to aterminal 9 of the surge protector through alead 8, and theterminal 9 connects to an outside circuit. The other electrode ofMOV 5 connects to theother terminal 10 of the surge protector, and thus the surge protector is connected to the circuit. - An
indicator bracket 6, which indicates the current state of the surge protector, is provided at an upper side of the frame bracket 2, and theindicator bracket 6 is biased towards the right side ofFig. 1 by anotherbiasing spring 7, i.e. the biasing direction is the same as the biasing direction that thebiasing springs 4 bias thetripping rod 1. One end of theindicator bracket 6 is an indication part, commonly in green color, the indication part can be exposed through an opening provided on a housing (not shown) of the surge protector, and thus the indication part is visible from outside. Similarly, a red indication part is formed on the frame bracket 2 at a position corresponding to the green indication part. - In the normal working state, the
tripping rod 1 is soldered toMOV 5 through low temperature solder, and thetripping rod 1 electrically and mechanically connects toMOV 5. Meanwhile, thetripping rod 1 is located at the position shown inFig. 1 , and theindicator bracket 6 is maintained at the position shown inFig. 1 by abutting against the upper end of thetripping rod 1; and at the same time, the green indication part on theindicator bracket 6 covers the red indication part on the frame bracket 2, and thus the green indication part, which indicates that the surge protector is currently in normal working state, can be seen from outside of the housing of the surge protector. - When the temperature rises to a certain level, the low-temperature solder melts, the
tripping rod 1 rotates clockwise about thepivot 3 in the figure under the action of thebiasing springs 4, and thus the electrical connection between thetripping rod 1 andMOV 5 is disconnected. Meanwhile, the remote signal switch lever 12 at the lower end of thetripping rod 1 triggers the remote control switch with the rotation of thetripping rod 1 so as to send to the remote control apparatus a signal indicating the tripping of thetripping rod 1. Furthermore, since thetripping rod 1 rotates clockwise, theindicator bracket 6 slides towards right on the upper side of the frame bracket 2 under the action of thebiasing spring 7, and thus the green indication part moves to the right side to expose the red indication part provided on the frame bracket 2, and thus the red indication part, which indicates the tripping of the surge protector, can be seen from outside of the housing of the surge protector. - However, the conventional tripping mechanism of the surge protector has following problems: the
tripping rod 1 moves substantially in a plane parallel to a side ofMOV 5, and thus even in the case that thetripping rod 1 trips, the electrical distance between thetripping rod 1 and the electrode ofMOV 5 is very short, and this is disadvantageous to the electrical isolation between thetripping rod 1 and the electrode ofMOV 5 in the trip state. Furthermore, the protection level and current leakage capacity of the standard MOV product are limited, and the cost of adopting non-standard single sheet product is high. So, for example, when a nominal discharge current of 35kA is required, two standard single sheet MOVs of 20kA are usually used to achieve this, so a solution occurs where two MOVs are used. In the case of adopting two or more MOVs, two or more tripping mechanisms mentioned above are needed, i.e. anothertripping rod 1 is provided in a similar manner on the rear side not shown in the figure, and theanother tripping rod 1 is soldered to another MOV located on the rear side of the figure. However, when the temperature rises, the twotripping rods 1 operate independently, it is difficult for the conventional tripping mechanism mentioned above to meet the needs that the two MOVs trip simultaneously. If it can not be ensured that the two MOVs trip simultaneously, such a case may occur that one MOV trips while the other fails to trip, the standard signal sheet MOV of 20kA may cause MOV explosion in a 35kA surge circumstance. - This invention is made based on the problems of the prior art, and an object of the invention is to provide a tripping mechanism for a surge protector, the tripping mechanism can ensure the electrical distance between a tripping rod and MOV in the trip state, and when a plurality of MOVs are used, simultaneously tripping of the plurality of MOVs can be easily realized.
- According to one aspect of the invention, there is provided a tripping mechanism, the tripping mechanism comprising: a frame bracket for receiving at least one metal oxide varistor; and a tripping rod pivotably arranged on the frame bracket and connected to the one electrode of the electrodes of the metal oxide rheostat via low temperature solder. The tripping mechanism further comprises a slidable block slidably arranged on the bracket frame, the slidable block is slidable between a first position and a second position and is biased towards a trip position; in a normal working state, the slidable block is maintained at the first position by the tripping rod counteracting the biasing pressure, and in a trip state, the sliding movement of the slidable block towards the second position under the action of the biasing pressure causes the tripping rod to pivot in a direction away from the electrode of the metal oxide varistor.
- Thus, in the trip state, since the tripping rod pivots away from the electrode of the metal oxide varistor, the electrical distance between the tripping rod and the electrode of the metal oxide varistor is increased, and thus the reliability of the electric insulation between the tripping rod and the electrode of the metal oxide varistor is improved.
- The tripping mechanism further is further provided with a swing arm which is pivotally mounted on the frame bracket, and the sliding movement of the slidable block towards the second position causes the swing arm to pivot to trigger a remote control switch.
- Thus, the tripping of the tripping rod and the swing of the swing arm are both realized by the movement of the slidable block, so the structure of the whole tripping mechanism is simplified, the manufacture cost is reduced and the reliability of the mechanism is improved.
- Preferably, the slidable block is provided a state indication part indicating the normal working state, and when the slidable block is at the first position, the state indication part is visible from outside through an opening or a transparent window provided in a housing of the surge protector.
- Furthermore, the frame bracket is provided with a state indication part indicating the trip state, when the slidable block is at the first position, the state indication part indicating the trip state is shielded by the state indication part indicating the normal working state provided on the slidable block, and when the slidable block is at the second position, the state indication part indicating the trip state is exposed and is visible from outside through the opening or the transparent window provided on the housing of the surge protector.
- Preferably, the slidable block comprises an inclined surface, the tripping rod abuts against the inclined surface when the slidable block is at the first position.
- Thus, a simple structure can be used to make the tripping rod trip.
- Preferably, the slidable block is located between the electrode and the tripping rod when the slidable block is at the second position. A channel is provided on a lower side of the inclined surface, the electrode is received in the channel when the slidable block is at the second position.
- Thus, in the trip state, besides increasing the distance between the tripping rod and the electrode, the slidable block is located between the tripping rod and the electrode of MOV, and receives the electrode in its channel, further enhancing the electrical insulation strength between the tripping rod and the electrode of MOV.
- Alternatively, the tripping mechanism further comprises one or more biasing springs, one end of which is attached to the slidable block, and the other end of which is attached to the frame bracket to bias the slidable block towards the second position.
- Preferably, a first end of the tripping rod pivotably connects to the frame bracket, and a second end of the tripping rod is welded to the electrode. Specifically, the second end of the tripping rod is formed with a slit, and the electrode is inserted into the slit and is welded thereto.
- The welding reliability between the electrode of MOV and the tripping rod can be improved by inserting the electrode of MOV into slit and being welded at the slit, and such lateral soldering method can reduce the thermal impact of the surge on the MOV.
- According to the other aspect of the invention, two metal oxide varistors are received in the bracket frame of the tripping mechanism, and the respective electrodes of the two metal oxide varistors are welded at the same position of the same tripping rod, i.e. the two respective electrodes of the two metal oxide varistors are both inserted into the slit of the tripping rod and are welded there through low-temperature solder.
- According to another aspect of the invention, there is provided a surge protector which comprises the above tripping mechanism.
- The above and other aspects, characteristics, advantages and technical and industrial importance of this invention will be more clearly understood from the following detailed description of the preferable embodiment of this invention taken in conjunction with the accompanying drawings in which:
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Fig. 1 is a schematic view of a tripping mechanism of a surge protector in the prior art; -
Fig. 2A is an exploded perspective view showing the tripping mechanism of the surge protector according to a preferred embodiment of the invention, the tripping mechanism comprises one MOV; -
Fig. 2B is a perspective view of the tripping mechanism after being assembled shown inFig. 2A ; -
Fig. 3A is a side view of the tripping mechanism shown inFig. 2B ; -
Fig. 3B is a cross-sectional view taken along line B-B inFig.3A ; -
Fig. 3C is an amplified view of the circled section inFig. 3B ; -
Fig. 4 is a perspective view of the tripping mechanism in the normal working state; -
Fig. 5 is a perspective view of the tripping mechanism in the trip state; -
Fig. 6A is an exploded perspective view illustrating the tripping mechanism of the surge protector according to another preferable embodiment of the invention, the tripping mechanism comprises two MOVs; -
Fig. 6B is a perspective view of the tripping mechanism after being assembled shown inFig. 6A ; -
Fig, 7A is a side view of the tripping mechanism shown inFig. 6B ; -
Fig. 7B is a cross-sectional view taken along line B-B inFig, 7A ; and -
Fig. 7C is an amplified view of the circled section inFig. 7B . - Hereinafter, the tripping mechanism according to the preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
- Referring to
Figs. 2A to 5 , a trippingmechanism 100 according to the first embodiment of the invention is disclosed. The trippingmechanism 100 comprises aframe bracket 110, theframe bracket 110 is substantially in the form of a square frame and is used to receive aMOV 200. Apivot 111 is formed at the right upper corner of theframe bracket 110, and a trippingrod 120 is pivotably arranged on theframe bracket 110 around thepivot 111. Specifically, a circular recess or a hole can be formed at one end 121 (the right end in the drawing) of the trippingrod 120, and thepivot 111 is inserted into the circular recess or the hole. Furthermore, the trippingrod 120 is connected to aterminal 300 of the surge protector through alead 122, and the terminal 300 is used for connecting the surge protector with an external circuit. - As clearly shown in
Figs. 4 and 5 , the other end of the trippingrod 120 is a connection end, the connection end is substantially in the form of a flat panel, aconcave platform 123 is formed at substantially the meddle part of the flat panel in the width direction of the flat panel shaped connection end, and theconcave platform 123 is formed with a throughslit 124 at its middle portion, the throughslit 124 may open at one end or both ends of the throughslit 124 are closed. - A
slidable block 130 is arranged on an upper side surface of theframe bracket 110. Theslidable block 130 is slidably arranged on the upper side surface of theframe bracket 110, for example, aguide portion 112 is provided on theframe bracket 110, and theslidable block 130 can slide under the guidance of theguide portion 112. Meanwhile, as shown in the drawings, biasingsprings 140 are further provided (two springs in the drawing), one end of the biasing springs is attached to the right end of theslidable block 130, and the other end of the biasing springs is attached to thepivot 111, and thus theslidable block 130 is biased towards the right side under the action of the biasing springs 140, i.e. is biased towards thepivot 111. At the bottom of theslidable block 130 there is formed with achannel 134 along the longitudinal direction, thechannel 134 is used to prevent theslidable block 130 from interfering with theelectrode 210 ofMOV 200 during the sliding of theslidable block 130, and this will be described later. Theslidable block 130 is formed with anindication part 131, i.e. a green indication part, at its left end. Similar to the prior art, in the state as shown inFig. 2B , the green indication part is exposed through an opening or a window provided in the housing of the surge protector to indicate that the surge protector is in a normal working state. - Another
pivot 113 is formed at the lower side of theframe bracket 110, aswing arm 150 is pivtoably arranged on theframe bracket 110 through thepivot 113, and one end (the lower end in the drawing) of theswing arm 150 is formed with aswitch trigger part 151 for triggering a remote control switch which is not shown in the drawing. The other end (the upper end in the drawing) of theswing arm 150, as shown inFig. 4 , is formed with a drivenportion 152 which engages with aprotrusion 132 provided on theslidable block 130, and the protrusion will push theswing arm 150 to rotate clockwise about thepivot 113 when theslidable block 130 slides towards the right side. - As shown in
Fig. 2A , theMOV 200 comprises twoelectrodes Figs. 3C and4 , in the normal working state, theMOV 200 is received in theframe bracket 110, and oneelectrode 210 of the MOV is inserted into theslit 124 formed in theconcave platform 123 of the trippingrod 120, and is connected to the trippingrod 120 through alow temperature solder 400. Theother electrode 220 of theMOV 200 is connected to theother terminal 500 of the surge protector, e.g. through welding, while theother terminal 500 is connected to an external circuit. On one hand, theMOV 200 is connected to one phase of the external circuit through the trippingrod 120 and the terminal 300, and on the other hand, is connected to the other phase of the external circuit through theother electrode 220 and theother terminal 500 of the surge protector, and when the voltage between the two phases of the external circuit exceeds the predetermined voltage, theMOV 200 conducts the two phases and functions to divide the current and reduce the voltage. - As shown in
Fig. 4 , in the normal working state, the middle part of theslidable block 130 is formed with aninclined surface 133, an edge of the connection end of the trippingrod 120 abuts against theinclined surface 133, and thus preventing theslidable block 130 from moving towards thepivot 111 by the biasingspring 140. In such a state, theslidable block 130 is located at the first position, theindication part 131 is visible from outside through the opening or the transparent window provided on the housing of the surge protector, thus indicating that the surge protector is in a normal working state. - When the temperature in the surge protector rises and reaches or exceeds the predetermined temperature threshold value, the
low temperature solder 400 melts, and at this time, the connection between the trippingrod 120 and theelectrode 210 of theMOV 200 is released, and thus the trippingrod 120 cannot serve the function of preventing theslidable block 130 from sliding anymore. Under such circumstance, the sildable block 130 slides towards the right side direction in the drawing under the action of the biasing pressure of the biasing springs 140, and at the same time, theinclined surface 133 of thesliable block 130 pushes the trippingrod 120 upward to make the trippingrod 120 rotate clockwise in the drawing about thepivot 111.Fig. 5 shows the tripping mechanism in the trip state. In the state shown inFig. 5 , theslidable block 130 has slided to the second position on the right side, pushing the trippingrod 120 away upward, and at the same time theslidable block 130 covers theelectrode 210 of theMOV 200; at this time, theelectrode 210 is received in thechannel 134, and thus theelectrode 210 and the trippingrod 130 are electrically isolated. Meanwhile, as can be seen fromFig. 5 , thegreen indication part 131 has moved to the right, and thus ared indication part 114, which is provided on theframe bracket 110 and was shielded by thegreen indication part 131, is exposed. As the slidable block slides towards right, theprotrusion 132 on theslidable block 130 pushes the drivenportion 152 of theswing arm 150, making theswing arm 150 rotate clockwise about thepivot 113, and thus theswitch trigger part 151 triggers the remote control switch (not shown), sending surge protector tripping signal to the remote control apparatus. -
Figs. 6 and7 show the tripping mechanism according to the second embodiment of the invention, the structure of this tripping mechanism is substantially the same as that of the one described above, the difference lies in that theframe bracket 110 receives twoMOVs 200. Thus, as shown inFig. 7C , the electrodes of theMOVs 200 are both inserted into the slit 240 of the trippingrod 120, and are welded to the trippingrod 120 through low-temperature solder 400. Thus, when the temperature rises, even in the case that twoMOVs 200 transfer different amount of heat to the welding point through their respective electrode, since the heat is applied to the same welding point, and thus the mechanism trips simultaneously. Since other parts of the second embodiment are the same as the first embodiment, and the description is omitted. - According to the tripping mechanism of the invention, in the trip state, the tripping
rod 120 rotates in a direction away from theelectrode 210 of theMOV 200, as a result, the electrical distance between the trippingrod 120 and theelectrode 210 is increased, the reliability of the electrical insulation between the trippingrod 120 and theelectrode 210 is improved. - Furthermore, according to the tripping mechanism of the invention, in the trip state, the
slidable block 130 slides to a position between the trippingrod 120 and theelectrode 210 of theMOV 200, and covers theelectrode 210 of theMOV 200, and thus the electrical insulation strength between the trippingrod 120 and theelectrode 210 is further enhanced. - Furthermore, according to the tripping mechanism of the invention, the
electrodes 210 of twoMOVs 200 are welded at the same position of the trippingrod 120 by using low-temperature solder, when the temperature rises, even if twoMOVs 200 transfer different amount of heat to the welding point through their respective electrode, since the hest is applied to the same welding point, the mechanism will trip simultaneously, and thus improve the reliability of the tripping mechanism. - Furthermore, according to this invention, both the pivoting of the tripping
rod 120 and the swing of theswing arm 150 are activated by the sliding of theslidable block 130, as a result, the structure of the whole tripping mechanism is simplified, the cost of the production is saved and the reliability of the whole tripping mechanism is improved. - Although the invention has been described in connection with the preferred embodiments of this invention, it should be understood that the invention is not limited to the disclosed specific embodiments, and based on the teaching, those skilled in the art can make various modifications, variations and alternatives to these embodiments. Accordingly, this invention is intended to cover all these modifications, variations and alternatives, and the protection scope of this invention is only defined by the attached claims and their equivalents.
Claims (12)
- A tripping mechanism for a surge protector, the tripping mechanism comprising:a frame bracket for receiving at least one metal oxide varistor; anda tripping rod pivotably arranged on the frame bracket and connected to the an electrode of the metal oxide rheostat via low temperature solder,characterized in that:the tripping mechanism further comprising a slidable block slidably arranged on the bracket frame, the slidable block being slidable between a first position and a second position and being biased towards a trip position; in a normal working state, the slidable block being maintained at the first position by the tripping rod counteracting the biasing pressure, and in a trip state, the sliding movement of the slidable block towards the second position under the action of the biasing pressure causing the tripping rod to pivot in a direction away from the electrode of the metal oxide varistor.
- The tripping mechanism according to claim 1, characterized in that further comprising a swing arm pivotally mounted on the frame bracket, and the sliding movement of the slidable block towards the second position causes the swing arm to pivot so as to trigger a remote control switch.
- The tripping mechanism according to claim 1, characterized in that the slidable block is provided with a state indication part indicating the normal working state, and when the slidable block is at the first position, the state indication part is visible from outside through an opening or a transparent window arranged in a housing of the surge protector.
- The tripping mechanism according to claim 3, characterized in that the frame bracket is provided with a state indication part indicating the trip state, when the slidable block is at the first position, the state indication part indicating the trip state is shielded by the state indication part indicating the normal working state provided on the slidable block, and when the slidable block is at the second position, the state indication part indicating the trip state is exposed and is visible from outside through the opening or the transparent window provided on the housing of the surge protector.
- The tripping mechanism according to claim 1, characterized in that the slidable block comprises an inclined surface, the tripping rod abuts against the inclined surface when the slidable block is at the first position.
- The tripping mechanism according to claim 5, characterized in that, the slidable block is located between the electrode and the tripping rod when the slidable block is at the second position.
- The tripping mechanism according to claim 6, characterized in that a channel is provided on a lower side of the inclined surface, the electrode is received in the channel when the slidable block is at the second position.
- The tripping mechanism according to claim 1, characterized in that further comprising one or more biasing springs, one end of the spring(s) is(are) attached to the slidable block, and the other end of the spring(s) is(are) attached to the frame bracket to bias the slidable block towards the second position.
- The tripping mechanism according to claim 1, characterized in that a first end of the tripping rod pivotably connects to the frame bracket, and a second end of the tripping rod is welded to the electrode.
- The tripping mechanism according to claim 9, characterized in that the second end of the tripping rod is formed with a slit, and the electrode is inserted into the slit and is welded thereto.
- The tripping mechanism according to any one of the above claims, characterized in that the two metal oxide varistors are received in the bracket frame, and the respective electrodes of the two metal oxide varistors are welded at the same position of the same tripping rod.
- A surge protector, characterized in that the surge protector comprising at least one metal oxide varistor and a tripping mechanism according to any one of Claims 1 to 11.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201110346844.8A CN103094013B (en) | 2011-11-07 | 2011-11-07 | The tripping mechanism of surge protector and surge protector |
PCT/CN2012/084178 WO2013067923A1 (en) | 2011-11-07 | 2012-11-07 | Tripping mechanism for surge protector and surge protector |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2765590A1 true EP2765590A1 (en) | 2014-08-13 |
EP2765590A4 EP2765590A4 (en) | 2015-05-20 |
EP2765590B1 EP2765590B1 (en) | 2016-10-19 |
Family
ID=48206464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12847145.5A Active EP2765590B1 (en) | 2011-11-07 | 2012-11-07 | Tripping mechanism for surge protector and surge protector |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2765590B1 (en) |
CN (1) | CN103094013B (en) |
BR (1) | BR112014010904B1 (en) |
ES (1) | ES2611404T3 (en) |
WO (1) | WO2013067923A1 (en) |
ZA (1) | ZA201404030B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3872830A1 (en) * | 2020-02-27 | 2021-09-01 | Legrand France | Electrical surge protection appliance and a varistor device with detection of thermal runaway |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108418181A (en) * | 2018-05-18 | 2018-08-17 | 谭乔文 | A kind of time lagged type surge protector back-up protection device of no afterflow non-blind area error-free motion |
CN112054496B (en) * | 2020-09-04 | 2022-06-03 | 上海闪替电子科技有限公司 | Surge protection module |
CN114552548B (en) * | 2022-03-05 | 2023-08-01 | 安徽诺希电气设备科技有限公司 | Overvoltage protector with high safety performance |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2657994B1 (en) * | 1990-02-08 | 1992-04-17 | Merlin Gerin | DISCONNECTABLE SURGE PROTECTOR FOR LOW VOLTAGE NETWORK. |
AT400781B (en) * | 1993-11-02 | 1996-03-25 | Felten & Guilleaume Ag Oester | OVERVOLTAGE PROTECTION DEVICE |
CN2566515Y (en) * | 2002-08-05 | 2003-08-13 | 浙江神龙电器有限公司 | Surge protector for place-in low voltage distributing system |
CN2636474Y (en) * | 2003-06-18 | 2004-08-25 | 杨金锡 | Duplex self protection type power source lightning proof module |
EP1745533B1 (en) * | 2004-04-19 | 2012-06-06 | ABB France | Surge voltage protection device with improved disconnection and visual indication means |
CN200976332Y (en) * | 2006-11-06 | 2007-11-14 | 浙江恒丰光电技术有限公司 | Electrical source surge protector |
CZ2009164A3 (en) * | 2009-03-16 | 2010-09-29 | Cernicka@Jozef | Overvoltage protection device |
CN201466705U (en) * | 2009-05-11 | 2010-05-12 | 上海雷尔盾电气有限公司 | Surge protection device |
CN101834434B (en) * | 2009-07-27 | 2012-05-23 | 佛山市浦斯电子有限公司 | Surge protector with thermal protection device |
FR2954579B1 (en) * | 2009-12-18 | 2014-07-04 | Schneider Electric Ind Sas | OVERVOLTAGE PROTECTION ASSEMBLY |
CN202282310U (en) * | 2011-11-07 | 2012-06-20 | 施耐德电器工业公司 | Tripping mechanism of surge protection device and surge protection device |
-
2011
- 2011-11-07 CN CN201110346844.8A patent/CN103094013B/en active Active
-
2012
- 2012-11-07 BR BR112014010904-4A patent/BR112014010904B1/en active IP Right Grant
- 2012-11-07 ES ES12847145.5T patent/ES2611404T3/en active Active
- 2012-11-07 EP EP12847145.5A patent/EP2765590B1/en active Active
- 2012-11-07 WO PCT/CN2012/084178 patent/WO2013067923A1/en active Application Filing
-
2014
- 2014-06-03 ZA ZA2014/04030A patent/ZA201404030B/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3872830A1 (en) * | 2020-02-27 | 2021-09-01 | Legrand France | Electrical surge protection appliance and a varistor device with detection of thermal runaway |
FR3107780A1 (en) * | 2020-02-27 | 2021-09-03 | Legrand France | Electrical device against transient overvoltages and a thermal runaway detection varistor device |
Also Published As
Publication number | Publication date |
---|---|
EP2765590A4 (en) | 2015-05-20 |
CN103094013B (en) | 2015-12-23 |
EP2765590B1 (en) | 2016-10-19 |
ZA201404030B (en) | 2015-12-23 |
BR112014010904A2 (en) | 2017-04-18 |
BR112014010904B1 (en) | 2021-01-05 |
CN103094013A (en) | 2013-05-08 |
ES2611404T3 (en) | 2017-05-08 |
WO2013067923A1 (en) | 2013-05-16 |
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